Feeding mechanism for sewing-machines



J. A. FLANAGAN.

FEEDING MECHANISM FOR SEWING MACHINES.

APPLICATION FILEDJUNE17.1919. RENEWED JJNE 9.1921.

Patented Aug. 9,1921.

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feed and looper shafts area in;

FEEDING MEGHANISM FOR SEWING-MACHINES.

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Application filed June 17, 1919, Serial No 304,792.

To all whom, it may concern.

Be it known that I, JAMES ALEXANDER FLANAGAN, a. British subject, and resident of the city of Toronto, in the county of York and Province of Ontario,Dominion of Canada, have invented certain new and useful Improvements in Feeding Mechanism for Sewing-lilachines; and I hereby declare the following to be a full, clear, and exact description of the same.

M y present invention relates to a specially designed feeding mechanism for sewing machines, this mechanism comprising a slide vertically reciprocated by the rotation of the looper shaft and a feed dog reciprocating vertically with the slide and having lateral reciprocating movement independently of it, imparted by the rocking action of the feed shaft.

For an understanding of the invention, 1 have shown and described it in connection with the feed and looper motions forming the subject matter of my application for Letters Patent, Serial Number 274902, filed February 4th, 1919, in which. the feed and looper shafts are in coaxial relation, but the invention may,- by alterations and changes within the scope of the claims, be adapted for other types of feed and looper motions.

In the accompanying drawings:

Figure l, is a sectional elevational view of so much of sewing machine as is necessary to illustrate the present invention,

Fig. 2, is a side-sectional elevational view of the feeding mechanism on a larger scale than Fig. 1,

Fig, 3, is an elevational view showing the vertical; slideway for the feed slide,

Fig. 4, is a plan view of the slideway shown in Fig. 3, and V Fig. 5, is an elevational view of the feed slide, the feed (log and the feed cam.

As an illustration-of how'the invention may be carried into effect Ihave shown in Figs. 1 and 2, a tubular feed shaft a journaled in suitable bearing-s b, b, forming part of, or rigidly connected to the frame 0.

I have also shownin the same figures a looper shaft d, extending axially through the feed shaft and projecting beyond the ends thereof, this arrangement bringing the The feed shaft a is provided at or near its front end witha radial arme extending in the direction of the throat plate 0. This arm 6 is provided with a hub e the rear face flneeification of Letters Patent.

to the front face of the into co-axial relation.

Patented Aug. 9, i921. Renewed June 9, 1921. Serial No. 476,345.

of which is formed with a bore c to receive.

and shaft being pinned,l. eyed or otherwise fastened together for their united movement. The hub 6' extends forwardly be yond the shaft a and is bored to receive, and serve as a bearing 6, for the front end of the looper shaft (Z, and fixed on the rear end of the feed shaft isa cap bored to form the rear bearing 6 for the looper shaft d.

Bolted or otherwise stationarily fastened bearing 6 is a block it having a recess h of such shape and dimensions as will permit of the oscillating movement of the e; In. the block it at the sides-of the recess h are slideways k, and vertically movable in the slideways h" is the feed slide As shown in the drawings the top of the feed slide 2' is formed with a dovetail groove j, which serves as a slideway for the laterally reciprocating feed dog Z, having a dovetail tongue is, which enters within the dovetail groove 7' and provides the sliding connection between these two parts. The dovetail formation of the groove 7' and tongue 70 may be varied or modified from that shown in the drawings as any other type of a sliding connection between these parts may be substituted for those shown and described. Projecting from the feed dog Z is a pin m, which takes in an elongated slot 0 in the oscillating arm 6, the elongation of the slot 0 bein 'in a radial direction from the center of the feed; shaft and of sufficient length to provide for, the full vertical movement of the feed dog during its rise and fall.

In the feed slide 6 is a bore z" and fixed on the looper shaft is a cam 32, operating within the bore 2" and causing the rise and fall of the feed slide during the revolution .of the looper shaft and imparting to the feed slide a reciprocating movement.

The cam 72 is so timed and designed as to come into engagement with the top of the bore 71 and positively lift the feed slide 2' to its elevated position when the needle has delivered the thread to the hook and receded from the material. While the slide is in this position the feed dog is reciprocated forwardly by the action of the arm e. The cam Q) then positively lowers the feed slide to the limit of its downward reci rocation for the feed dog to release the wor When the slide is at the limit of its downward reciprocation the arm e moves the feed dog rearward to again engage the inzitei'iei when the s ide is raised to the limit of its upward reciprocation. in this way it positive vertical reciprocation of the slide enC. feed dog is effected by means of the earn 22, and. a positive hite'ul reciprocation of'the feed (log independently of the sli ie is effected by the arm c the lateral reciprocation of the feed dog being in e plane parallel with the work".

From the foregoing it Wiil be understood that during the revolution of the loopei shaft the cam p elternateiy comes into contact with the top of the bore 5 to raise the feed slide to the limit of its upwsrii reciprocetion, and momentarily maintain it stationery for the feed (ing to move the work forwardly, end-that when the Work has been fed forward for the next stitch the cam g2 comes into contact with the bottom of the bore enii causes the descent of the feed slide 2' to the limit oi its (iOWEiWztlti reciprocation, during which the feed (log; releases the imrii; and moves i'earvardly for the next stitch. The elongated slot 0 is of snl'iicient ieng tli to permit of the rise and felt of the pin on, to the full depth of the vertical movement of the feed (log and feed. slicie The feed shaft a is reciproceted by at suitable drive r preferably connected with the cop forming the rear bearing c" for the looper shaft, and e rotating motion is imparted to the iooper shaft of by'ziny suitable drive 5 connected With it the looner shaft project ing beyond the rear bearing for that purpose,

' By means of this construction it positive Verticei reciprocation is imparted to the feed clog by ti'ieloopcr shaft and :1 positive leterni reciprocation is imported to it by the see shaft.

thieving thus fully described my invention, What I cleiln as new and desire to secure by Letters Patent, is:

1. feeding mechanism for sewing machines comprising it reciprocating feed slide, having an open center a hollow ice-4i, shaft it looper shaft extending through the teed shaft, a com on the looper shaft within the open center of the slide causing its recipro" cetion, a feed (log having a htterol sliding;

connection with the slide for reci n'ociition therewith, and means rocked by the feed shaft, rousing the reciprocation of tbe'feeil (log); laterally with respect to the slide luring its reciprocation by the cum.

mechanism for sewing inss comprising n. reciprocating feed slide, haying an open center, it hollow feed shaft, it iooper short extending through the teed shaft, #1 czinion the looper shaft Within the open center of the slide, causing its reciprocation, e tfeerl dog having a lateral, slidingconnection with the slide for reciprocation. therewith, and a rocker lllll connected with feeci sheft, cruising the reciprocation of the teed. dog leterelly with respect to the slide during its reciprocation by the coin.

A feeding mecliei'iisin for sewing; Inechines comprising :1 vertical sliclewny, a feed slide having on open center movable in the sliiienniy s hollow teed shaft, :1 iooper shaft extended ti'iroogh the feed shaft, a corn on the looper shett operating in the open center of the slide anti causing its reciprocation, it teed ring having a. lateral sliding connection with the slide for reciprocation therewith and rocked by the feed shaft causing; the reconnection oi the feed log laterally with respect to the slide during; its reciprocation b en isnicin for sewing insenil looper shafts, if}; slide lowing en l by the loopcr ore nnil causing vi reci \1 oi said slide inrocating i (i053; vertically ""i said slide, (LII ttI'IH oscil- .i i'i li il having an elongated e ii e ni' for said feed.

' 1 the lateral l'eeil dog during the J2 m not opeistin; in s i'eciprocnti oscillation 5. A

- :hnnisrn chines cozngni loo' vcrticuliy recinroczz ingr slide having," on

therein it coin rotated by the loo per wing in Sikili epert we and ceasing the ver .cei reciprocation of said slide, a laterally recioroceting teeil dog vertically reci inocetin with said siitle an arm connected with the feed. shot't and scilieteci thereby, causing: the lateral reciprocation of the feed tier-5 and it stzitioi'iery siidewey for the verticeiiy ZQitifflfliiittil'lfl: slide.

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